Hi. The other person in the MV is Yena. Yuqi appeared in one of Yena's MVs last year ("hate Rodrigo"). Bibi has also been in one of Soyeon's songs - "is this bad b**** number?"
This first song is a song/art piece. It’s sad, cute, and deep. In the beginning of the video, the man says that she always wants far too much, because he keeps providing everything for her, but she still doesn’t seem happy. Inwardly, this infuriates her because she doesn’t want all the fancy expensive things he provides for her, it’s not that it’s not enough it’s that it’s too much. All that she wants is “chestnut red bean jelly“ which is a metaphor for his simple, true affection. She doesn’t want far too much. She wants only the smallest genuine thing. He is hiding his heart, and true self from her, and trying to make up for it with lots of things and outward expressions.
The other girl, Yena, is a former IZ*ONE member, now a soloist. Bibi was featured in Yena's solo debut song, Smiley. Bibi also previously featured in Soyeon's solo b-side, 'Is This Bad B****** Number?' along with Lee Youngji. Bibi has a lot of great music, but if you want some suggestions to start with, I'd say Kazino, Bibi Vengeance, and Animal Farm.